他们用手机通信。
They communicate by phone.
通信
to correspond (by letter, email etc); to send or receive messages through telecommunications
verb HSK 3.0 · Band 6
Watch it being written
Every character draws itself, stroke by stroke. Then grab the brush: trace it yourself and hear the word when you finish.
通
信
Nice writing!
Build with these blocks
Chinese words snap together like bricks. Every word below shares a character with this one, so you are already halfway to knowing it.
通
See it in sentences
通信工具坏了怎么办？
What if the communication tools break down?